Blanche Lake vs Mason Lake
Water quality, depth, fish species, and recreation comparison.
Blanche Lake has a higher water quality grade (A, Excellent) than Mason Lake (C, Fair). Both are in Otter Tail County, Minnesota.
Blanche Lake and Mason Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. Blanche Lake (A) is materially cleaner than Mason Lake (C). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Blanche Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Blanche Lake
Good clarity, visible to about 12.5 ft.
Mason Lake
Very murky, less than 3 ft of visibility.
Side-by-Side Metrics
| Metric | Blanche Lake | Mason Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 12.5 ft | 3 ft |
| Phosphorus | 11 µg/L | 21 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 64 ft | 108 ft |
| Surface Area | 1.3K acres | 5.6K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Blanche Lake wins on overall water quality with a Grade A versus Mason Lake's Grade C. Water clarity: 12.5 ft vs 3 ft. For fishing diversity, Blanche Lake also leads with 1 species.